Search market share change
also called Share deltaPeriod-over-period share move
Definition
The period-over-period move in your CTR-modeled search market share, returned as an absolute difference in share points alongside a proportional change.
Scope, grain and dimensions
- Grain
- One segment × period pair × medium.
- Dimensions
- intent · brand · keyword · page · category · country · rank_bucket
- Required filters
- segment_id · selected_period · comparison_range · source_medium
- Aggregation
- Not summable. Each period pair produces its own difference; chaining them does not give a longer-period move.
- Metric type
- derived metric · share points for the absolute move
Data sources
Where you'll see this
Named reports that normally include this metric.
Skills and analyses that use it
Skills carry the judgment; the analysis verbs do the reading.
Analysis verbs
growth_vs_market_sharemarket_share_breakdowncompetitive_trends
Method rungs and levers
A rung tells you what a movement here can and cannot explain, read the rungs below it first.
levers L2 Demand modeling
Ask Quattr
- "Did our search market share move against last month?" Simulate this →
- "Which rows moved most between the two periods?" Simulate this →
Caveats, freshness and failure modes
The comparison leg is the identical query with only the period filter swapped, so any filter difference between the two legs invalidates the pair.
The proportional change is computed as the difference over the earlier value and is returned as a fraction here, while the significance verbs express the same idea as a percent, the two must not be quoted interchangeably.
The share leg's delta is returned unrounded while the count legs beside it are rounded to two decimal places, so a share move and a click move in the same row are not reported at the same precision.
A move is not a verdict: nothing in this figure tests whether the change is distinguishable from noise.
- Freshness
- ~1 day behind, Daily observation, available the following day.
Common failure modes
- Rendering the fraction as if it were already a percentage, inflating the move a hundredfold.
- Calling a share move real without running the significance check.
Not the same as
The confusions that cause the most wrong decisions.
Search market share change Gap to leader Compare definitions →
The gap compares two domains in one period; this compares one domain across two periods.
Watch this metric read in a real run
All runs →
1 min 44 secTraffic just dropped. Is it you, or the market?Search Console + Rank tracking · Market share review◐Recreated from an anonymized session
3 min 4 secThe fix shipped. Traffic rose. Now two teams want the credit.Lighthouse + Search Console + Rank tracking · Significance referee · Cross domain correlator◐Recreated from an anonymized session
2 min 26 secConversion rate fell 7.5%. The number is real. The panic is not.Web analytics · Significance referee◐Recreated from an anonymized session
2 min 2 secSomething went right this quarter. Now prove it before you say it out loud.Rank tracking + Search Console · SERP feature watch · Significance referee◐Recreated from an anonymized session
2 min 18 secThe deck is due tomorrow. The numbers live in five places.Search Console + Rank tracking + AI visibility + Web analytics + Google Ads · Monthly exec review◐Recreated from an anonymized session
2 min 20 secWhere do we stand? Five questions answer it, in order.Search Console + Rank tracking + AI visibility · Monthly exec review◐Recreated from an anonymized session
Related metrics and workflows
Verification
A definition is the smallest part of this.
The measurement matters because something acts on it. Here is the rest of the showcase, in the order most people find useful.